[metrics-bugs] #31649 [Metrics]: Add ant task in metrics-base to fetch metrics-lib/exonerator from dist

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#31649: Add ant task in metrics-base to fetch metrics-lib/exonerator from dist
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 Reporter:  irl       |          Owner:  metrics-team
     Type:  task      |         Status:  new
 Priority:  Very Low  |      Milestone:
Component:  Metrics   |        Version:
 Severity:  Normal    |     Resolution:
 Keywords:            |  Actual Points:
Parent ID:            |         Points:
 Reviewer:            |        Sponsor:
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Comment (by karsten):

 I wonder if there are situations where we want to upgrade the metrics-lib
 version in some of our code bases but not all of them. In that case,
 having the version in metrics-base might cause problems.

 Note that we'll have to update versions in the respective `build.xml`
 files anyway. Should be fine to do it in the GitLab CI file, too. What do
 you think?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31649#comment:1>
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